Fixes #260

This pull request introduces a new AppendText method to multiple enum types across the codebase. This method appends the textual representation of the enum to a byte slice and is implemented consistently across all affected types. Additionally, tests and snapshot updates are included to verify and document the changes.

New AppendText Method Implementations:

• Added AppendText method to the following types:
  • Color in example/color_enum.go
  • Commented and ComplexCommented in example/commented_enum.go [1] [2]
  • Make, NoZeros in example/example_enum.go [1] [2]
  • Shop in example/replace_prefix_enum.go
  • IntShop in example/replace_prefix_int_enum.go
  • ProjectStatus in example/sql_enum.go
  • StrState in example/strings_only_enum.go

Testing Enhancements:

• Added a new test TestColorAppendText to validate the behavior of the AppendText method for the Color type in example/color_test.go. This test ensures the method produces the correct output and matches the behavior of MarshalText and String.

Snapshot Updates:

• Updated snapshots in generator/.snapshots to reflect the addition of the AppendText method for various enum types:
  • Test118CustomPrefixExampleFile-1.18 [1] [2]
  • Test118CustomPrefixExampleFile-og [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13]